package im.actor.keygen.curve25519;

// Disabling Bounds checks for speeding up calculations

/*-[
#define J2OBJC_DISABLE_ARRAY_BOUND_CHECKS 1
]-*/

public class sc_muladd {

//CONVERT #include "sc.h"
//CONVERT #include "long.h"
//CONVERT #include "crypto_uint32.h"
//CONVERT #include "long.h"

    public static long load_3(byte[] in, int index) {
        long result;
        result = ((long) in[index + 0]) & 0xFF;
        result |= (((long) in[index + 1]) << 8) & 0xFF00;
        result |= (((long) in[index + 2]) << 16) & 0xFF0000;
        return result;
    }

    public static long load_4(byte[] in, int index) {
        long result;
        result = (((long) in[index + 0]) & 0xFF);
        result |= ((((long) in[index + 1]) << 8) & 0xFF00);
        result |= ((((long) in[index + 2]) << 16) & 0xFF0000);
        result |= ((((long) in[index + 3]) << 24) & 0xFF000000L);
        return result;
    }

/*
Input:
  a[0]+256*a[1]+...+256^31*a[31] = a
  b[0]+256*b[1]+...+256^31*b[31] = b
  c[0]+256*c[1]+...+256^31*c[31] = c

Output:
  s[0]+256*s[1]+...+256^31*s[31] = (ab+c) mod l
  where l = 2^252 + 27742317777372353535851937790883648493.
*/

    public static void sc_muladd(byte[] s, byte[] a, byte[] b, byte[] c) {
        long a0 = 2097151 & load_3(a, 0);
        long a1 = 2097151 & (load_4(a, 2) >>> 5);
        long a2 = 2097151 & (load_3(a, 5) >>> 2);
        long a3 = 2097151 & (load_4(a, 7) >>> 7);
        long a4 = 2097151 & (load_4(a, 10) >>> 4);
        long a5 = 2097151 & (load_3(a, 13) >>> 1);
        long a6 = 2097151 & (load_4(a, 15) >>> 6);
        long a7 = 2097151 & (load_3(a, 18) >>> 3);
        long a8 = 2097151 & load_3(a, 21);
        long a9 = 2097151 & (load_4(a, 23) >>> 5);
        long a10 = 2097151 & (load_3(a, 26) >>> 2);
        long a11 = (load_4(a, 28) >>> 7);
        long b0 = 2097151 & load_3(b, 0);
        long b1 = 2097151 & (load_4(b, 2) >>> 5);
        long b2 = 2097151 & (load_3(b, 5) >>> 2);
        long b3 = 2097151 & (load_4(b, 7) >>> 7);
        long b4 = 2097151 & (load_4(b, 10) >>> 4);
        long b5 = 2097151 & (load_3(b, 13) >>> 1);
        long b6 = 2097151 & (load_4(b, 15) >>> 6);
        long b7 = 2097151 & (load_3(b, 18) >>> 3);
        long b8 = 2097151 & load_3(b, 21);
        long b9 = 2097151 & (load_4(b, 23) >>> 5);
        long b10 = 2097151 & (load_3(b, 26) >>> 2);
        long b11 = (load_4(b, 28) >>> 7);
        long c0 = 2097151 & load_3(c, 0);
        long c1 = 2097151 & (load_4(c, 2) >>> 5);
        long c2 = 2097151 & (load_3(c, 5) >>> 2);
        long c3 = 2097151 & (load_4(c, 7) >>> 7);
        long c4 = 2097151 & (load_4(c, 10) >>> 4);
        long c5 = 2097151 & (load_3(c, 13) >>> 1);
        long c6 = 2097151 & (load_4(c, 15) >>> 6);
        long c7 = 2097151 & (load_3(c, 18) >>> 3);
        long c8 = 2097151 & load_3(c, 21);
        long c9 = 2097151 & (load_4(c, 23) >>> 5);
        long c10 = 2097151 & (load_3(c, 26) >>> 2);
        long c11 = (load_4(c, 28) >>> 7);
        long s0;
        long s1;
        long s2;
        long s3;
        long s4;
        long s5;
        long s6;
        long s7;
        long s8;
        long s9;
        long s10;
        long s11;
        long s12;
        long s13;
        long s14;
        long s15;
        long s16;
        long s17;
        long s18;
        long s19;
        long s20;
        long s21;
        long s22;
        long s23;
        long carry0;
        long carry1;
        long carry2;
        long carry3;
        long carry4;
        long carry5;
        long carry6;
        long carry7;
        long carry8;
        long carry9;
        long carry10;
        long carry11;
        long carry12;
        long carry13;
        long carry14;
        long carry15;
        long carry16;
        long carry17;
        long carry18;
        long carry19;
        long carry20;
        long carry21;
        long carry22;

        s0 = c0 + a0 * b0;
        s1 = c1 + a0 * b1 + a1 * b0;
        s2 = c2 + a0 * b2 + a1 * b1 + a2 * b0;
        s3 = c3 + a0 * b3 + a1 * b2 + a2 * b1 + a3 * b0;
        s4 = c4 + a0 * b4 + a1 * b3 + a2 * b2 + a3 * b1 + a4 * b0;
        s5 = c5 + a0 * b5 + a1 * b4 + a2 * b3 + a3 * b2 + a4 * b1 + a5 * b0;
        s6 = c6 + a0 * b6 + a1 * b5 + a2 * b4 + a3 * b3 + a4 * b2 + a5 * b1 + a6 * b0;
        s7 = c7 + a0 * b7 + a1 * b6 + a2 * b5 + a3 * b4 + a4 * b3 + a5 * b2 + a6 * b1 + a7 * b0;
        s8 = c8 + a0 * b8 + a1 * b7 + a2 * b6 + a3 * b5 + a4 * b4 + a5 * b3 + a6 * b2 + a7 * b1 + a8 * b0;
        s9 = c9 + a0 * b9 + a1 * b8 + a2 * b7 + a3 * b6 + a4 * b5 + a5 * b4 + a6 * b3 + a7 * b2 + a8 * b1 + a9 * b0;
        s10 = c10 + a0 * b10 + a1 * b9 + a2 * b8 + a3 * b7 + a4 * b6 + a5 * b5 + a6 * b4 + a7 * b3 + a8 * b2 + a9 * b1 + a10 * b0;
        s11 = c11 + a0 * b11 + a1 * b10 + a2 * b9 + a3 * b8 + a4 * b7 + a5 * b6 + a6 * b5 + a7 * b4 + a8 * b3 + a9 * b2 + a10 * b1 + a11 * b0;
        s12 = a1 * b11 + a2 * b10 + a3 * b9 + a4 * b8 + a5 * b7 + a6 * b6 + a7 * b5 + a8 * b4 + a9 * b3 + a10 * b2 + a11 * b1;
        s13 = a2 * b11 + a3 * b10 + a4 * b9 + a5 * b8 + a6 * b7 + a7 * b6 + a8 * b5 + a9 * b4 + a10 * b3 + a11 * b2;
        s14 = a3 * b11 + a4 * b10 + a5 * b9 + a6 * b8 + a7 * b7 + a8 * b6 + a9 * b5 + a10 * b4 + a11 * b3;
        s15 = a4 * b11 + a5 * b10 + a6 * b9 + a7 * b8 + a8 * b7 + a9 * b6 + a10 * b5 + a11 * b4;
        s16 = a5 * b11 + a6 * b10 + a7 * b9 + a8 * b8 + a9 * b7 + a10 * b6 + a11 * b5;
        s17 = a6 * b11 + a7 * b10 + a8 * b9 + a9 * b8 + a10 * b7 + a11 * b6;
        s18 = a7 * b11 + a8 * b10 + a9 * b9 + a10 * b8 + a11 * b7;
        s19 = a8 * b11 + a9 * b10 + a10 * b9 + a11 * b8;
        s20 = a9 * b11 + a10 * b10 + a11 * b9;
        s21 = a10 * b11 + a11 * b10;
        s22 = a11 * b11;
        s23 = 0;

        carry0 = (s0 + (1 << 20)) >> 21;
        s1 += carry0;
        s0 -= carry0 << 21;
        carry2 = (s2 + (1 << 20)) >> 21;
        s3 += carry2;
        s2 -= carry2 << 21;
        carry4 = (s4 + (1 << 20)) >> 21;
        s5 += carry4;
        s4 -= carry4 << 21;
        carry6 = (s6 + (1 << 20)) >> 21;
        s7 += carry6;
        s6 -= carry6 << 21;
        carry8 = (s8 + (1 << 20)) >> 21;
        s9 += carry8;
        s8 -= carry8 << 21;
        carry10 = (s10 + (1 << 20)) >> 21;
        s11 += carry10;
        s10 -= carry10 << 21;
        carry12 = (s12 + (1 << 20)) >> 21;
        s13 += carry12;
        s12 -= carry12 << 21;
        carry14 = (s14 + (1 << 20)) >> 21;
        s15 += carry14;
        s14 -= carry14 << 21;
        carry16 = (s16 + (1 << 20)) >> 21;
        s17 += carry16;
        s16 -= carry16 << 21;
        carry18 = (s18 + (1 << 20)) >> 21;
        s19 += carry18;
        s18 -= carry18 << 21;
        carry20 = (s20 + (1 << 20)) >> 21;
        s21 += carry20;
        s20 -= carry20 << 21;
        carry22 = (s22 + (1 << 20)) >> 21;
        s23 += carry22;
        s22 -= carry22 << 21;

        carry1 = (s1 + (1 << 20)) >> 21;
        s2 += carry1;
        s1 -= carry1 << 21;
        carry3 = (s3 + (1 << 20)) >> 21;
        s4 += carry3;
        s3 -= carry3 << 21;
        carry5 = (s5 + (1 << 20)) >> 21;
        s6 += carry5;
        s5 -= carry5 << 21;
        carry7 = (s7 + (1 << 20)) >> 21;
        s8 += carry7;
        s7 -= carry7 << 21;
        carry9 = (s9 + (1 << 20)) >> 21;
        s10 += carry9;
        s9 -= carry9 << 21;
        carry11 = (s11 + (1 << 20)) >> 21;
        s12 += carry11;
        s11 -= carry11 << 21;
        carry13 = (s13 + (1 << 20)) >> 21;
        s14 += carry13;
        s13 -= carry13 << 21;
        carry15 = (s15 + (1 << 20)) >> 21;
        s16 += carry15;
        s15 -= carry15 << 21;
        carry17 = (s17 + (1 << 20)) >> 21;
        s18 += carry17;
        s17 -= carry17 << 21;
        carry19 = (s19 + (1 << 20)) >> 21;
        s20 += carry19;
        s19 -= carry19 << 21;
        carry21 = (s21 + (1 << 20)) >> 21;
        s22 += carry21;
        s21 -= carry21 << 21;

        s11 += s23 * 666643;
        s12 += s23 * 470296;
        s13 += s23 * 654183;
        s14 -= s23 * 997805;
        s15 += s23 * 136657;
        s16 -= s23 * 683901;
        s23 = 0;

        s10 += s22 * 666643;
        s11 += s22 * 470296;
        s12 += s22 * 654183;
        s13 -= s22 * 997805;
        s14 += s22 * 136657;
        s15 -= s22 * 683901;
        s22 = 0;

        s9 += s21 * 666643;
        s10 += s21 * 470296;
        s11 += s21 * 654183;
        s12 -= s21 * 997805;
        s13 += s21 * 136657;
        s14 -= s21 * 683901;
        s21 = 0;

        s8 += s20 * 666643;
        s9 += s20 * 470296;
        s10 += s20 * 654183;
        s11 -= s20 * 997805;
        s12 += s20 * 136657;
        s13 -= s20 * 683901;
        s20 = 0;

        s7 += s19 * 666643;
        s8 += s19 * 470296;
        s9 += s19 * 654183;
        s10 -= s19 * 997805;
        s11 += s19 * 136657;
        s12 -= s19 * 683901;
        s19 = 0;

        s6 += s18 * 666643;
        s7 += s18 * 470296;
        s8 += s18 * 654183;
        s9 -= s18 * 997805;
        s10 += s18 * 136657;
        s11 -= s18 * 683901;
        s18 = 0;

        carry6 = (s6 + (1 << 20)) >> 21;
        s7 += carry6;
        s6 -= carry6 << 21;
        carry8 = (s8 + (1 << 20)) >> 21;
        s9 += carry8;
        s8 -= carry8 << 21;
        carry10 = (s10 + (1 << 20)) >> 21;
        s11 += carry10;
        s10 -= carry10 << 21;
        carry12 = (s12 + (1 << 20)) >> 21;
        s13 += carry12;
        s12 -= carry12 << 21;
        carry14 = (s14 + (1 << 20)) >> 21;
        s15 += carry14;
        s14 -= carry14 << 21;
        carry16 = (s16 + (1 << 20)) >> 21;
        s17 += carry16;
        s16 -= carry16 << 21;

        carry7 = (s7 + (1 << 20)) >> 21;
        s8 += carry7;
        s7 -= carry7 << 21;
        carry9 = (s9 + (1 << 20)) >> 21;
        s10 += carry9;
        s9 -= carry9 << 21;
        carry11 = (s11 + (1 << 20)) >> 21;
        s12 += carry11;
        s11 -= carry11 << 21;
        carry13 = (s13 + (1 << 20)) >> 21;
        s14 += carry13;
        s13 -= carry13 << 21;
        carry15 = (s15 + (1 << 20)) >> 21;
        s16 += carry15;
        s15 -= carry15 << 21;

        s5 += s17 * 666643;
        s6 += s17 * 470296;
        s7 += s17 * 654183;
        s8 -= s17 * 997805;
        s9 += s17 * 136657;
        s10 -= s17 * 683901;
        s17 = 0;

        s4 += s16 * 666643;
        s5 += s16 * 470296;
        s6 += s16 * 654183;
        s7 -= s16 * 997805;
        s8 += s16 * 136657;
        s9 -= s16 * 683901;
        s16 = 0;

        s3 += s15 * 666643;
        s4 += s15 * 470296;
        s5 += s15 * 654183;
        s6 -= s15 * 997805;
        s7 += s15 * 136657;
        s8 -= s15 * 683901;
        s15 = 0;

        s2 += s14 * 666643;
        s3 += s14 * 470296;
        s4 += s14 * 654183;
        s5 -= s14 * 997805;
        s6 += s14 * 136657;
        s7 -= s14 * 683901;
        s14 = 0;

        s1 += s13 * 666643;
        s2 += s13 * 470296;
        s3 += s13 * 654183;
        s4 -= s13 * 997805;
        s5 += s13 * 136657;
        s6 -= s13 * 683901;
        s13 = 0;

        s0 += s12 * 666643;
        s1 += s12 * 470296;
        s2 += s12 * 654183;
        s3 -= s12 * 997805;
        s4 += s12 * 136657;
        s5 -= s12 * 683901;
        s12 = 0;

        carry0 = (s0 + (1 << 20)) >> 21;
        s1 += carry0;
        s0 -= carry0 << 21;
        carry2 = (s2 + (1 << 20)) >> 21;
        s3 += carry2;
        s2 -= carry2 << 21;
        carry4 = (s4 + (1 << 20)) >> 21;
        s5 += carry4;
        s4 -= carry4 << 21;
        carry6 = (s6 + (1 << 20)) >> 21;
        s7 += carry6;
        s6 -= carry6 << 21;
        carry8 = (s8 + (1 << 20)) >> 21;
        s9 += carry8;
        s8 -= carry8 << 21;
        carry10 = (s10 + (1 << 20)) >> 21;
        s11 += carry10;
        s10 -= carry10 << 21;

        carry1 = (s1 + (1 << 20)) >> 21;
        s2 += carry1;
        s1 -= carry1 << 21;
        carry3 = (s3 + (1 << 20)) >> 21;
        s4 += carry3;
        s3 -= carry3 << 21;
        carry5 = (s5 + (1 << 20)) >> 21;
        s6 += carry5;
        s5 -= carry5 << 21;
        carry7 = (s7 + (1 << 20)) >> 21;
        s8 += carry7;
        s7 -= carry7 << 21;
        carry9 = (s9 + (1 << 20)) >> 21;
        s10 += carry9;
        s9 -= carry9 << 21;
        carry11 = (s11 + (1 << 20)) >> 21;
        s12 += carry11;
        s11 -= carry11 << 21;

        s0 += s12 * 666643;
        s1 += s12 * 470296;
        s2 += s12 * 654183;
        s3 -= s12 * 997805;
        s4 += s12 * 136657;
        s5 -= s12 * 683901;
        s12 = 0;

        carry0 = s0 >> 21;
        s1 += carry0;
        s0 -= carry0 << 21;
        carry1 = s1 >> 21;
        s2 += carry1;
        s1 -= carry1 << 21;
        carry2 = s2 >> 21;
        s3 += carry2;
        s2 -= carry2 << 21;
        carry3 = s3 >> 21;
        s4 += carry3;
        s3 -= carry3 << 21;
        carry4 = s4 >> 21;
        s5 += carry4;
        s4 -= carry4 << 21;
        carry5 = s5 >> 21;
        s6 += carry5;
        s5 -= carry5 << 21;
        carry6 = s6 >> 21;
        s7 += carry6;
        s6 -= carry6 << 21;
        carry7 = s7 >> 21;
        s8 += carry7;
        s7 -= carry7 << 21;
        carry8 = s8 >> 21;
        s9 += carry8;
        s8 -= carry8 << 21;
        carry9 = s9 >> 21;
        s10 += carry9;
        s9 -= carry9 << 21;
        carry10 = s10 >> 21;
        s11 += carry10;
        s10 -= carry10 << 21;
        carry11 = s11 >> 21;
        s12 += carry11;
        s11 -= carry11 << 21;

        s0 += s12 * 666643;
        s1 += s12 * 470296;
        s2 += s12 * 654183;
        s3 -= s12 * 997805;
        s4 += s12 * 136657;
        s5 -= s12 * 683901;
        s12 = 0;

        carry0 = s0 >> 21;
        s1 += carry0;
        s0 -= carry0 << 21;
        carry1 = s1 >> 21;
        s2 += carry1;
        s1 -= carry1 << 21;
        carry2 = s2 >> 21;
        s3 += carry2;
        s2 -= carry2 << 21;
        carry3 = s3 >> 21;
        s4 += carry3;
        s3 -= carry3 << 21;
        carry4 = s4 >> 21;
        s5 += carry4;
        s4 -= carry4 << 21;
        carry5 = s5 >> 21;
        s6 += carry5;
        s5 -= carry5 << 21;
        carry6 = s6 >> 21;
        s7 += carry6;
        s6 -= carry6 << 21;
        carry7 = s7 >> 21;
        s8 += carry7;
        s7 -= carry7 << 21;
        carry8 = s8 >> 21;
        s9 += carry8;
        s8 -= carry8 << 21;
        carry9 = s9 >> 21;
        s10 += carry9;
        s9 -= carry9 << 21;
        carry10 = s10 >> 21;
        s11 += carry10;
        s10 -= carry10 << 21;

        s[0] = (byte) (s0 >> 0);
        s[1] = (byte) (s0 >> 8);
        s[2] = (byte) ((s0 >> 16) | (s1 << 5));
        s[3] = (byte) (s1 >> 3);
        s[4] = (byte) (s1 >> 11);
        s[5] = (byte) ((s1 >> 19) | (s2 << 2));
        s[6] = (byte) (s2 >> 6);
        s[7] = (byte) ((s2 >> 14) | (s3 << 7));
        s[8] = (byte) (s3 >> 1);
        s[9] = (byte) (s3 >> 9);
        s[10] = (byte) ((s3 >> 17) | (s4 << 4));
        s[11] = (byte) (s4 >> 4);
        s[12] = (byte) (s4 >> 12);
        s[13] = (byte) ((s4 >> 20) | (s5 << 1));
        s[14] = (byte) (s5 >> 7);
        s[15] = (byte) ((s5 >> 15) | (s6 << 6));
        s[16] = (byte) (s6 >> 2);
        s[17] = (byte) (s6 >> 10);
        s[18] = (byte) ((s6 >> 18) | (s7 << 3));
        s[19] = (byte) (s7 >> 5);
        s[20] = (byte) (s7 >> 13);
        s[21] = (byte) (s8 >> 0);
        s[22] = (byte) (s8 >> 8);
        s[23] = (byte) ((s8 >> 16) | (s9 << 5));
        s[24] = (byte) (s9 >> 3);
        s[25] = (byte) (s9 >> 11);
        s[26] = (byte) ((s9 >> 19) | (s10 << 2));
        s[27] = (byte) (s10 >> 6);
        s[28] = (byte) ((s10 >> 14) | (s11 << 7));
        s[29] = (byte) (s11 >> 1);
        s[30] = (byte) (s11 >> 9);
        s[31] = (byte) (s11 >> 17);
    }


}
